Molar Mass of HNO2 (Nitrous Acid)

Molar Mass Calculator

What is the molar mass of HNO₂?

Answer

M(HNO₂) =

47.013 g/mol

Atomic weights: IUPAC standard values (CIAAW, 2024).

Contribution of each element
Element	Atoms, n	Atomic weight, A	n × A, g/mol Mass fraction, w	Mass fraction, w
Hhydrogen	1	1.0080	1.0080 w ≈ 2.14%	≈ 2.14%
Nnitrogen	1	14.007	14.007 w ≈ 29.79%	≈ 29.79%
Ooxygen	2	15.999	31.998 w ≈ 68.06%	≈ 68.06%
Σ = 47.013 g/mol w = 100%				100%

Each fraction is rounded on its own, so the printed ones add up to 99.99%; unrounded, they make exactly 100%.

Atomic weights: CIAAW, Abridged Standard Atomic Weights (2024)

Mass fractions of the elements

O 68.06%

N 29.79%H 2.14%

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Molar masses of substances nearby

Formula	M, g/mol
HCOOH (formic acid)	46.025
C₂H₅OH (ethanol)	46.069
CH₆N₂ (monomethylhydrazine)	46.073
HNO₂ (nitrous acid)	47.013
Ti (titanium)	47.867
O₃ (ozone)	47.997
SO (sulfur monoxide)	48.06

FAQ

What is the molar mass of HNO2?

M(HNO₂) = 47.013 g/mol

How to calculate the molar mass of HNO₂?

Add up the atomic weights of all the atoms in the formula: 1.0080 + 14.007 + 2 × 15.999 = 47.013 g/mol.

How many grams are in 2 moles of HNO₂?

m = n × M = 2 mol × 47.013 g/mol = 94.026 g.

See Also